Thread structure

Abstract

The utility model discloses a thread structure which comprises a body, threads and a thread groove are arranged on the body, the thread groove comprises an upper cavity with a wide upper part and a narrow lower part and a lower cavity with a wide upper part and a narrow lower part, and an included angle between two side edges of the upper cavity is larger than an included angle between two side edges of the lower cavity. According to the thread structure provided by the utility model, the lower cavity of the thread groove has more abundant space for storing the lubricating grease, so that the frequency of adding the lubricating grease is reduced. In addition, the thread structures are matched with the corresponding trapezoidal thread pieces, the contact area is relatively small, and friction resistance in the movement process is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of threaded connection, in particular to a threaded structure. Background Art

[0002] The thread structure in the prior art, whether its thread is triangular thread, rectangular thread, trapezoidal thread or other forms, generally has the following deficiencies: (1) After two threaded parts (for example: screw and screw nut) are matched, the contact surface between the thread (commonly known as "teeth") and the thread groove (commonly known as "tooth groove") is large, which will generate large friction during movement, not only hindering the movement, but also causing easy wear of the contact surface; (2) The ability of the thread groove to store grease is average, and grease needs to be applied to the threaded parts frequently. In view of the above technical problems, the utility model proposes a new thread structure, the ability of the thread groove to store grease is greatly improved, and the contact surface is reduced after matching with the corresponding threaded parts, thereby reducing the friction resistance during movement. Utility Model Content

[0003] In view of the above-mentioned deficiencies of the prior art, the purpose of the present invention is to provide a thread structure, aiming to solve the technical problems in the prior art that the friction resistance of the threaded parts is large after mating and the ability of the thread groove to store grease is average.

[0004] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0005] A thread structure comprises a body, on which a thread and a thread groove are arranged, wherein the thread groove comprises an upper cavity which is wider at the top and narrower at the bottom and a lower cavity which is wider at the top and narrower at the bottom, and the angle between the two sides of the upper cavity is greater than the angle between the two sides of the lower cavity.

[0006] Furthermore, in the thread structure, the bottom of the thread groove is parallel to the length direction of the body.

[0007] Furthermore, in the thread structure, the cross section of the upper cavity is an isosceles trapezoid, and the cross section of the lower cavity is an isosceles trapezoid.

[0008] Furthermore, in the thread structure, a connection between the side of the upper cavity and the side of the lower cavity on the same side is provided with a rounded corner, and the rounded corner protrudes into the thread groove.

[0009] Furthermore, in the thread structure, the radius of the fillet is 1 to 2 times the depth of the thread groove.

[0010] Furthermore, in the threaded structure, the included angle between the two sides of the upper cavity is 2.5 to 3.5 times the included angle between the two sides of the lower cavity.

[0011] Furthermore, in the threaded structure, the angle between the two sides of the upper cavity is in the range of 40° to 45°, and the angle between the two sides of the lower cavity is in the range of 12° to 18°.

[0012] Beneficial effects: The utility model provides a thread structure. Compared with the prior art, since the angle between the two sides of the upper cavity of the thread groove is greater than the angle between the two sides of the lower cavity, the lower cavity of the thread groove has more space for storing grease, thereby reducing the frequency of adding grease. In addition, the thread structure cooperates with the corresponding trapezoidal thread member, and the contact area is relatively smaller, which reduces the friction resistance during movement. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a simplified structural diagram of the thread structure provided by the utility model.

[0014] Figure 2 This is a schematic diagram of the cooperation between the thread structure and the trapezoidal thread member provided by the utility model. DETAILED DESCRIPTION

[0015] The utility model provides a thread structure. To make the purpose, technical solution and effect of the utility model clearer and more specific, the utility model is further described in detail below. It should be understood that the specific embodiments described here are only used to explain the utility model, and are not used to limit the utility model.

[0016] See also Figure 1 The utility model provides a thread structure. The attached drawings are only used to explain the structural principle and are not proportional to the actual product. The attached drawings only depict the structures related to the invention of this application, and some conventional structures are not specifically depicted. For the convenience of marking, Figure 1 No hatching is drawn.

[0017] The thread structure comprises a body 1, on which a thread 2 and a thread groove 3 are arranged, wherein the thread groove comprises an upper cavity 31 which is wide at the top and narrow at the bottom, and a lower cavity 32 which is wide at the top and narrow at the bottom, and the angle between the two side edges 311 of the upper cavity ( Figure 1 The angle A in the lower cavity is greater than the angle between the two side edges 321 of the lower cavity ( Figure 1 Angle B in the figure).

[0018] Preferably, the groove bottom 322 of the thread groove (ie: Figure 1 The bottom side of the middle and lower cavity is parallel to the length direction of the body (i.e., the axial direction).

[0019] Preferably, the cross section of the upper cavity is an isosceles trapezoid, and the cross section of the lower cavity is an isosceles trapezoid. This arrangement facilitates the thread structure to cooperate with a threaded member provided with a trapezoidal thread. It should be noted that, since the angle A between the two sides of the upper cavity is greater than the angle B between the two sides of the lower cavity, the upper cavity and the lower cavity combined together are not a complete trapezoid.

[0020] Preferably, the connection between the side of the upper cavity and the side of the lower cavity on the same side is provided with a rounded corner (such as Figure 1 As shown in the position pointed by the arrow R in FIG. 1 ), the rounded corner protrudes into the thread groove. By setting the rounded corner, the connection transition between the side of the upper cavity and the side of the lower cavity is natural. Figure 2 As shown, when matched with the trapezoidal thread member 9, the side wall of the thread 91 of the trapezoidal thread member contacts and is tangent to the fillet, which makes it easy for the thread groove of the thread structure to adapt to the thread of the trapezoidal thread member.

[0021] Preferably, the radius of the fillet is 1 to 2 times the depth H of the thread groove.

[0022] Preferably, the included angle A between the two sides of the upper cavity is 2.5 to 3.5 times the included angle B between the two sides of the lower cavity.

[0023] Preferably, the included angle range of the two sides of the upper cavity is 40°~45°, and the included angle range of the two sides of the lower cavity is 12°~18°.

[0024] It should be noted that the above-mentioned threaded structure can be used to be set as an external threaded structure (for example: a screw, a lead screw, etc.), and can also be used to be set as an internal threaded structure (for example: a nut, etc.). This is not limited here, so the accompanying drawings do not specifically show whether the threaded structure is an external thread or an internal thread.

[0025] Compared with the conventional threaded parts, when the threaded structure described in the present application is matched with the corresponding trapezoidal threaded parts, the lower cavity of the thread groove has more space for storing grease, thereby reducing the frequency of adding grease. In addition, when the threaded structure is matched with the corresponding trapezoidal threaded parts, the contact area is relatively smaller, which reduces the friction resistance during movement.

[0026] It is understandable that those skilled in the art can make equivalent substitutions or changes based on the technical solution and the utility model concept of the utility model, and all these changes or substitutions should fall within the protection scope of the utility model.

Claims

1. A thread structure, comprising a body, on which a thread and a thread groove are arranged, characterized in that: The thread groove includes an upper cavity which is wider at the top and narrower at the bottom, and a lower cavity which is wider at the top and narrower at the bottom. The included angle between the two sides of the upper cavity is greater than the included angle between the two sides of the lower cavity. A rounded corner is provided at the connection between the side of the upper cavity and the side of the lower cavity on the same side, and the rounded corner protrudes into the thread groove. The thread structure is used to cooperate with a trapezoidal thread member, and the thread side wall of the trapezoidal thread member is in contact with the rounded corner and is in a tangent state.

2. The thread structure according to claim 1, characterized in that: The groove bottom of the thread groove is parallel to the length direction of the body.

3. The thread structure according to claim 2, characterized in that: The cross section of the upper cavity is an isosceles trapezoid, and the cross section of the lower cavity is an isosceles trapezoid.

4. The thread structure according to claim 1, characterized in that: The radius of the fillet is 1 to 2 times the depth of the thread groove.

5. The thread structure according to claim 1, characterized in that: The included angle between the two sides of the upper cavity is 2.5 to 3.5 times the included angle between the two sides of the lower cavity.

6. The thread structure according to claim 1, characterized in that: The included angle range of the two sides of the upper cavity is 40°~45°, and the included angle range of the two sides of the lower cavity is 12°~18°.

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